ESP32C3 add program ways in Linux (#8237)

bsp/ESP32_C3/README.md

@@ -135,11 +135,15 @@ Type "apropos word" to search for commands related to "word".
 
 ## Download and program
 
+In Windows, we can use *flash* supported by ESPRESSIF.
+
+In Linux, we can use the esptool, which we have downloaded serval steps
+
+### Windows
+
 1. Programming tool download
 
-     The current bsp test uses the `flash_download_tool_3.9.4` tool to program without errors.
+     The current bsp test uses the [Flash Download Tools](https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.4_0.zip) tool to program without errors.
-
-     Programming tool download address: [https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.4_0.zip](https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.4_0.zip)
 
 2. Programming tool configuration
 
@@ -157,6 +161,17 @@ Type "apropos word" to search for commands related to "word".
 
      ![flash_download_tools](images/flash_download_tools.png)
 
+### Linux
+
+```sh
+esptool.py -b 115200 --before default_reset --after hard_reset write_flash --flash_mode dio --flash_size detect --flash_freq 80m 0x0 path/to/your/bootloader.bin 0x08000 path/to/your/partition-table.bin 0x010000 path/to/your/rtthread.bin
+```
+if you have more than one ESP device connected, you can use -p to choose which device to use.
+
+if the command failed, check whether user ave enough privilige to access the serials. 
+
+or we can check ESPRESSIF's [Troubleshooting](https://docs.espressif.com/projects/esptool/en/latest/esp32/troubleshooting.html) to get more help.
+
 ## Notes
 
 - The basic functions are now supported, but it needs more, welcome any contributions and feedback. 

bsp/ESP32_C3/README_ZH.md

@@ -143,11 +143,15 @@ Type "apropos word" to search for commands related to "word".
 
 ## 下载烧录
 
+Windows 下可以使用「乐鑫科技」提供的 flash 工具进行烧录
+
+Linux 下可以使用先前下载的 esptool 进行烧录
+
+### Windows
+
 1. 烧录工具下载
 
-    当前bsp测试使用`flash_download_tool_3.9.4`工具进行烧录无误。
+    当前bsp测试使用 [Flash Download Tools](https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.4_0.zip) 工具进行烧录无误。
-
-    烧录工具下载地址：[https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.4_0.zip](https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.4_0.zip)
 
 2. 烧录工具配置
 
@@ -165,6 +169,17 @@ Type "apropos word" to search for commands related to "word".
 
     ![flash_download_tools](images/flash_download_tools.png)
 
+### Linux 下进行烧录
+
+```sh
+  esptool.py -b 115200 --before default_reset --after hard_reset write_flash --flash_mode dio --flash_size detect --flash_freq 80m 0x0 path/to/your/bootloader.bin 0x08000 path/to/your/partition-table.bin 0x010000 path/to/your/rtthread.bin
+```
+
+当多个 ESP 设备连接时，可以使用 -p 指定某个设备
+
+如果失败，可考虑是否是因为 user 权限不够，无法直接访问串口。
+或参考乐鑫[官方文档](https://docs.espressif.com/projects/esptool/en/latest/esp32/troubleshooting.html)进行查错。
+
 ## 注意事项
 
 - 目前RTTHREAD支持起来了，后续会需要继续完善一些其他功能，刚开始使用ESP32，欢迎小伙伴一起来讨论和贡献。感兴趣的可以通过公众号`Thomas的小火车`来联系